"I'm Troy McClure! You may remember me from such automated information kiosks as "Welcome to Springfield Airport", and "Where's Nordstrom?". While you're enjoying our hall of wonders, your car will be unfortunately be subject to repeated break-ins... "

Catherine Bell who played Marine lawyer Sarah Mackenzie on JAG for 9 seasons was cast in another military-themed series, Army Wives.

Corbin Bernsen is well-known as lawyer Arnie Becker from L.A. Law. Fast forward two decades, and we find him playing Shawn Spencer's dad on Psych.

David Boreanaz spent eight years playing the vampire Angel in Buffy the Vampire Slayer and the eponymous spinoff. As of 2013, he's spent another eight as FBI Agent Seeley Booth in the romantic forensic procedural Bones.

Ben Browder is known for two famous sci-fi roles: John Crichton on Farscape, and Cameron Mitchell on Stargate SG-1. He acted opposite Claudia Black (Aeryn Sun and Vala mal Doran, respectively) on both series; naturally Lampshade Hanging ensued on the latter about the former.

Yvette Nicole Brown, who starred in Drake & Josh as Helen Dubious, makes a guest appearance as the exact same character, six years later, in Victorious.

Becky from Roseanne as Elliot from Scrubs. No, not that Becky* Alicia "Lecy" Goransen, the other one* Sarah Chalke.

Micky Dolenz became popular in the 1950's as a child actor under the pseudonym Mickey Braddock. He starred in the TV series Circus Boy as the lead character, Corky. Only until mid-1960's was Dolenz launched into superstardom as one of the members of The Monkees.

Keir Dullea appeared as Devon, the protagoinist of the much maligned 70s TV series The Starlost. Get rid of the 70s mustache he wore in the series, you'll recognize him as Dave Bowman from 2001: A Space Odyssey.

Up until the mid-90s Noel Edmonds was a celebrity Saturday night entertainment show presenter, before which he was a successful DJ. He dropped out of the limelight for several years before reemerging in 2005 as the host of the British version of the game show Deal or No Deal. Similarly, Howie Mandel was a popular prop comic who played Dr. Fiscus on St. Elsewhere, then voiced the title character on Bobby's World. After years of obscurity he resurfaced as host of the US edition of Deal or No Deal.

Mark Harmon has come back for more stardom at least twice. People who watched Chicago Hope may remember him from his role in St. Elsewhere. Now, of course, both of those shows are road markers for fans of NCIS.

Dennis Haysbert was first known to many as voodoo power hitter Pedro Cerrano in Major League. After a few parts that didn't go far, he shows up on 24 as President Palmer, then as the team leader in The Unit, and is know known as the Allstate guy.

Amanda Winn Lee was a prolific voice actress for ADV Films, most well known for her roles as Rally Vincent and Rei Ayanami. After her son Nicholas's birth and diagnosis of leukemia, she dropped out of anime voice acting to spend time with him. Since her son's recovery, she has returned to voice acting, but this time focusing on video games published by Atlus, her most famous recent role being Yukiko Amagi from Persona 4.

Christopher Lee played Dracula in a series of horror movies in his younger days. More recently, he's played villains in summer blockbusters such as the Star Wars prequels and The Lord of the Rings. And a major character in Kingdom Hearts II. Going back a bit further, to the mid-70s, Lee was also Scaramanga in The Man with the Golden Gun. He also did some spoken lines for the band Rhapsody of Fire. In fact, Sir Christopher holds the Guinness Record for the highest number of film acting roles ever... but 95% of people know him from this handful of roles.

Troy McClure, from many films such as The Contrabulous Fabtraption of Horatio Hufnagel, Android Beach Party, Hitler Doesn't Live Here Anymore, Gladys the Groovy Mule, Muppets go Medieval, Preacher with a Shovel and many, many more.

In the The Sixties and The Seventies, Jerry Orbach was a famous Broadway star. He was in the inaugural cast of The Fantasticks, he was the first Billy Flynn in Chicago, and he even got a few movie roles. Fast forward thirty years, and what is he best known for? Lennie Briscoe on Law & Order. If anyone even knows he could sing, they probably know it because they saw him as Lumiere in Beauty and the Beast.

Marcia Wallace was, at one point, sufficiently well-known from her role on The Bob Newhart Show in the '70s to be the subject of a Taxi episode (in which she guested as herself) later in that decade, as well as an appearance as her Bob Newhart character on Murphy Brown. Later on, of course, she became the voice of Mrs. Krabappel on The Simpsons.

Elijah Wood was a famous child actor known as the other Macaulay Culkin (they even co-starred in T Film/heGoodSon) years before being cast as Frodo.

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